When you worry so much about getting sunlight for Vit D that, even when working/messing around online, you sit RIGHT under your sky-light attic window and soak as much up as possible. And when, whilst sitting there typing away, you use one typing hand, alternate hands and hold a 4kg weight in your non-typing hand, to make sure it doesn't get idle.

When you're out to dinner at a Teppanyaki restaurant with friends and you watch in horror as the chef cuts off and prepares to discard the fat from the steaks...and you say "Hey, please can I have those? It's the best part!" and he does. With a wink and a nod in agreement

Or when you roast a turkey at said friend's house and claim dibs on the crispy skin and that fatty part of the tail (my mom called it the Pope's Nose) and they all look at you like you've lost your mind.